Electric motor



(No Model.)

H. A. CHASE.

ELECTRIC MOTOR.

N0. 389,1 7. Patented Sept. 11, 1888.

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N. PETERS, Pbo'wlnhcgmphen Washmglnn. n. c.

UNITED STATES PATENT OEEIQE.

HENRY A. CHASE, OF STONEHAM, MASSACHUSETTS.

ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 389,197, datedSeptember 11, 1888.

Application filed April 16, 1888. Serial X0. 270,843. (No model.)

To aZZ whom it may concern.-

Be it known that I, HENRY A. CHASE, of Stoneham, county of Middlesex,State of Massachusetts, have invented an Improvement in Electric Motors,of which the following description, in connection with the accompanyingdrawing, is a specification, like letters on the drawing representinglike parts.

This invention has for its object to construct an electric motor; and itconsists in the combination, with two electro magnetic devices orsolenoids, of a hollow reciprocating bar having closed ends and servingas or forming the armature of the said electro-magnets or solenoicls,and a switch or electric cut-out adapted to be moved to cut out the saidelectromagnets alternately, thereby permitting the current to traversethe coils of first one and then the other eleetro-magnet, moving the baror piston armature first in one and then in the opposite direction;also, in the combination, with two electromagnetic devices or solenoidsthe tubular shanks of which have the larger quantity or mass of magneticmaterial at one end, of a reciprocating bar moving in said tubularshanks, substantially as will be described.

The invention also consists in details of construction, to behereinafter described.

The drawing shows in horizontal section an electric motor embodying thisinvention, the switch being shown in plan view.

The electro-magnets or solenoids A B are each constructed substantiallyalike, so that one only will be described.

A brass tube, a, has attached to it at one end a cap, 6, having a plateor disk, D, and a tubular or hollow tapering shank, if, said shankembracing a portion only of the tube a. The cap I) is made of magneticmaterial. A disk, 6 is attached to the tube a at the end opposite thecap. A spool is thus formed, the shank of which is composed of the tubea and shank b while the ends or heads are composed of the plate or diskZ) and disk D The hollow shank is closed at one end by the said cap b.The coil of wire 0 is wound upon the spool thus formed. The armature D,also made of magnetic material, is placed within the tube a, it beingmade cylindrical and attached to a rod, a, passing through the cap b orclosed end of the spool. A bracket or frame, E, is attached to the capI), and the rod 0 has its bearings in said bracket.

The electro magnet or solenoid thus far de scribed is substantially thesame as that shown and described in application for Letters Patent,Serial No. 269,504, filed April 3, 1888, to which reference may be had.

As herein shown,the two electro magnets A B, constructed as abovedescribed, are placed in line with each other, the rear ends or disks, babutting against each other and being attached by bolts 50, so that along chamber is formed within, closed at each end by the caps 12. Thearmatures D of the said magnets, in stead of being two independentarmatures, are made as a one piece or single bar, hollowed out orchambered, as at 3, to practically form a tube with closed ends 75, therods 0 being attached to the said ends, as before stated; or, in otherwords, to form the end pieces, 75, joined or connected by a tube. Thearmature bar is somewhat shorter than the long chamher in which it isplaced, so that it can move or be moved first toward the cap I) of oneand then toward the cap I) of the other solenoid; but such movement orstroke is less than the length of either shank b of the cap, and as thecaps are made of magnetic material, the armature moving away from eithercap never leaves the magnetic field of force.

The coils O, wound upon the spools, are independent of each other, andwhen the cur rent traverses one coil and is cut otl from the other coil,the armature is instantly moved toward the cap of the spool through thecoils of which the current is traversing, and vice versa.

The brass tube a prevents the armature sticking to the sides of thechamber, and as said armature is made hollow, except at the ends, andsaid ends lie in the magnetic field of force, said ends are drawn towardthe most central or intense part thereof, which is at or near the closedend of the chamber. It is designed to reciprocate the armaturebar, andhence the current is made to traverse the coil of one solenoid and thenthe other, and I have herein shown means for automatically effectingthis result. A switch composed of a lever or bar, 1', pivoted at l, isemployed, it having a crossbar, i secured to it. One arm of thecross-bar '5 is adapted to co-operate with or engage a contact block orlever, i, and the other arm of the cross-bar i is adapted to co-operatewith or engage another contact block or lever, z, said contact blocks orlevers being normally pressed against contactstops 13, respectively, bysprings. With the switch-arm im the position shown, the battery-currentpasses over wire 20, cross bar '6 block or lever 1', wire 21 to the coilof one of the electro-magnets or solenoids B, returning by wire 22 tobattery. When the switch arm or leveri is in its other position, thecurrent from battery passes over wire 20, cross-bar i, contact block orlever i wire 23 to the coil of the other magnet or solenoid, as A,returning by Wire 2a to battery. The switch is moved by a yoke, a,sliding on a bar or rod,n,said lever being connected with the yoke by apin, 11 An arm, a, secured to a rod, 11*, sliding in suitable bearings,strikes in its movement first one and then the other arm of the yoke,moving it a short distance. The rod a is connected with the rod 0 by abent arm, n", or other suitable connection.

It will be seen that as the current traverses the coils of the magnetsalternately the armature-bar will be reciprocatcd, and the switch arm orlever thereby moved.

I have placed two yielding or spring-controlled pins, m, in each cap I),to resist and limit the movement of the armature-bar.

I have made the armature-bar hollow,so that the magnetic force may focusor accumulate at the ends 75, and instead ofjoining the ends75 by a tubeit might be joined by a small rod much less in diameter than the ends75.

I claiml. In an electric motor, two electro-magnets or solenoids placedend to end to form a long cylindrical chamber within,combined with the'common hollow or tubular armature having closed ends, substantially asdescribed.

2. In an electric motor, two electro-magnets or solenoids, each composedof a spool having a tubular tapering shank and a closed end piece ofmagnetic material, combined with the armature movable toward and fromsaid closed ends in the magnetic field of the said tubular taperingshank, substantially as described.

3. In an electric motor, two electro magnets or solenoids, each composedof a spool having a tubular shank and an end piece having the plate ordisk I) and recessed shank, combined with the connected end pieces, b,substantially as described.

4. In an electric motor, two electro-magnets or solenoids, each composedof a spool having a tubular shank,part only of which is made of magneticmaterial, combined with the con neeted end pieces, 75, movable in thetubular shanks in the field of force of the magnetic material,substantially as described.

5. In an electric motor, two electro-magncts or solenoids,each havingone end of its tubular shank closed with magnetic material,combined withthe connected end pieces, 75, and with the yielding limiting-stops,substantially as described.

6. In an electric motor, two electro-magnets or solenoids and themovable armature, combined with the arm n moved directly or indirectlyby the armature, the yoke 11, and the switch arm or lever i,substantially as described.

In testimony whercofI have signed my name to this specification in thepresence of two subscribing witnesses.

I'IENRY A. CHASE.

Vitnesses:

BERNICE J. Noyes, HOWARD F. EATON.

